In the RCL instruction, the contents of the destination operand undergoes function as a) carry flag is pushed into LSB & MSB is pushed into carry flag b) carry flag is pushed into MSB & LSB is pushed into carry flag c) auxiliary flag is pushed into LSB & MSB is pushed into carry flag d) parity flag is pushed into MSB & ...

What is the function of RCL instruction Mcq?

Explanation: In RCL(Rotate right through carry), for each operation, the carry flag is pushed into LSB and the MSB of the operand is pushed into carry flag. Explanation: The instruction to which the REP is prefix, is executed repeatedly until CX register becomes zero.

What is the machine language instruction format consists of?

A machine language instruction format consists of Operation code field & operand field. The instruction, MOV AX, 1234H is an example of immediate addressing mode.

Which of the following is the instruction that unconditionally transfers the control of execution to the specified address is?

1.1 Jump Instruction. JMP (Jump) unconditionally transfers control to the target location. JMP is a one-way transfer of execution; it does not save a return address on the stack.

Which of the following instruction complements the content of carry flag Mcq?

The logical instructions that affect the carry flag during its execution are RL, RLC, RRC and RR. Explanation: The instruction, CPL Bit is used to complement or invert the bit of a bit addressable SFR or RAM.

rotate instructions of 8086 microprocessor | ROR ROL RCR RCL instructions

18 related questions found

Which of the following is an unconditional control transfer instruction?

Explanation: The instructions, JMP, RET, RETI, CALL are the unconditional control transfer instructions. Explanation: The conditional control transfer instructions use status flags or bits of bit addressable RAM or SFRs termed bit. 8.

Which instruction causes an unconditional transfer of control unconditional jump )?

 The jump and loop instructions transfer control to another part of the program.  To control the general flow of the instructions, jump instructions are used.  The JMP instruction causes an unconditional transfer of control.

Which of the following is a data transfer instructions?

• MOV. This instruction simply copies the data from the source to the destination. ...
• PUSH. This instruction is used to push data into the stack. ...
• POP. This instruction is used to get the data from the stack. ...
• XCHG. It exchanges the contents of the source and the destination. ...
• LAHF. ...
• SAHF. ...
• IN. ...
• OUT.

What microprocessor consists of?

Microprocessor consists of an ALU, register array, and a control unit. ALU performs arithmetical and logical operations on the data received from the memory or an input device. Register array consists of registers identified by letters like B, C, D, E, H, L and accumulator.

Which are the processors based on RISC?

1. Which are the processors based on RISC? Explanation: SPARC and MIPS processors are the first generation processors of RISC architecture. 2.

Which of the following are language processors?

Types of language processor are : assembler, compiler and interpreter.

What will be the content of BX after the execution of following?

BX register contains the starting offset address of the Lookup table. After execution , corresponding data memory contents of the lookup table are loaded into the AL register.

Which of the following is shift instructions?

The Shift Right instruction performs a right shift on the destinations operand, filling the lowest bit with 0. The lowest bit is moved into the Carry Flag. SAL (Shift Arithmetic Left) is identical to the SHL instruction. SAR (Shift Arithmetic Right) performs a right arithmetic shift on its operand.

What does NOP instruction introduces?

NOP is a mnemonic that stands for “No Operation”. This instruction does nothing during execution. Only it occupied 1-Byte of memory space and spends 4-Machine Cycles. ... So introduction of this NOP instruction can produce synchronization of the speed between these two.

What is the difference between conditional and unconditional jump?

Unconditional Jump Instructions: Transfers the program sequence to the described memory address. Conditional Jump Instructions Transfers the program sequence to the described memory address only if the condition in satisfied.

What is unconditional branch instruction?

The pseudocomputer has an unconditional branch instruction that always causes a branch. The mnemonic for the instruction is b : b label # branch to label # (pseudoinstruction) This instruction behaves like the jump instruction: it unconditionally loads the PC with the address specified by label .

What is unconditional transfer of control?

The jmp ( jump) instruction unconditionally transfers control to another point in the program. There are three forms of this instruction: a direct jump and two indirect jumps. The first instruction is a direct jump above. ...

What are the unconditional statements?

UnConditional statements allows you to direct the program's flow to another part of your program without evaluating conditions. Most unconditional statements requires a programmer defined keyword called a label.

Which of the following are unconditional control transfer statement?

break, continue and goto in C. In c, there are control statements that do not need any condition to control the program execution flow. These control statements are called as unconditional control statements. C programming language provides the following unconditional control statements...

What are unconditional control statements?

The break command unconditionally stops the execution of any loop in which it is encountered, and goes to the next command after the done, fi, or esac statement. If no commands follow that statement, the program ends.

Which of the following instructions Shiftes the contents of accumulator logically?

Shift Instructions: SRA (Shift Right Logical Accumulator) A value must be put into the shift-count location before the operation is started.

Which of the following instruction complements the content of carry?

Here STC stands for “SeT the Carry flag” and CMC stands for “CoMplement the Carry flag”. Note that, there isno dedicated instruction in 8085 instruction set to reset the Cy flagbit.

What will be the contents of accumulator after instruction XRA A is executed?

In 8085 Instruction, XRA is a mnemonic that stands for “eXclusive OR Accumulator” and “R” stands for any of the following registers, or memory location M pointed by HL pair. This instruction is used to Ex-OR contents of R with the Accumulator. ... It occupies only 1-Byte in memory.